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The LSB of g_signals was unused. The LSB of g1_start was used to indicate which group is G2. This was used to always go to sleep in pthread_cond_wait if a waiter is in G2. A comment earlier in the file says that this is not correct to do: "Waiters cannot determine whether they are currently in G2 or G1 -- but they do not have to because all they are interested in is whether there are available signals" I either would have had to update the comment, or get rid of the check. I chose to get rid of the check. In fact I don't quite know why it was there. There will never be available signals for group G2, so we didn't need the special case. Even if there were, this would just be a spurious wake. This might have caught some cases where the count has wrapped around, but it wouldn't reliably do that, (and even if it did, why would you want to force a sleep in that case?) and we don't support that many concurrent waiters anyway. Getting rid of it allows us to use one more bit, making us more robust to wraparound. Signed-off-by: Malte Skarupke <malteskarupke@fastmail.fm> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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